Noplag

Noplag is ranked #1 of 31 in plagiarism checkers on The Geeks Club. It runs on API, Linux, macOS, Self-hosted, Web, Windows. There is a free plan. A free trial is offered. Paid plans start at $9.99/mo.

Noplag plans and pricing

All plans

Free Free 3 checks per month · 2,500 words per check · Public web + Common Crawl corpus · Community Discord support noplag.com · 29 Sept 2026

Pro $9.99/mo 50 checks per month · 25,000 words per check · Noplag Database · Academic index · REST API + webhooks · Email support noplag.com · 29 Sept 2026

Premium $19.99/mo 200 checks per month · 50,000 words per check · Live Web search · Branded PDF reports · Priority support — 12h response noplag.com · 29 Sept 2026

Enterprise Not published Custom check volume · All corpora + Live Web search · On-prem or private cloud deploy · SSO / SAML · LMS integrations · Dedicated support + SLA noplag.com · 29 Sept 2026

Compared on plagiarism checkers

Free plan: Yes
Paid from: $9.99/mo
API access: Yes

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Noplag

Product: Noplag is an open-source plagiarism checker with a hosted cloud service and an engine released under Apache 2.0.
Matching: The live product uses winnowing fingerprints and live-web matching to find verbatim and near-verbatim copying; MinHash LSH and vector reranking are listed as future releases.
Sources: Its comparison sources include the open web, Common Crawl, Wikipedia, academic indexes, the Noplag Database, and users’ own folders.
Reports: Reports link each match to its source and show a similarity score and exact overlapping text, with PDF export.
Uploads: Users can upload DOCX, PDF, TXT, ODT, or RTF files, paste text, or submit a URL.
Languages: Detection is calibrated at launch for English, Spanish, Portuguese, Polish, and Ukrainian.
AI detection: AI-content detection is marked as coming soon and is intended to appear as a separate signal.
Integrations: The features page lists Canvas, Moodle, Blackboard, and Brightspace integrations via LTI 1.3.
API: The developer API is REST with an OpenAPI spec and webhooks, and is available on paid tiers.
Privacy: Noplag states that submitted documents are not used to train models or shared between accounts, and EU data residency is available.
Security: Noplag says it encrypts data in transit and at rest and does not yet hold formal attestations such as SOC 2.
Retention: Document content is purged 30 days after a free-tier check; paid users can choose a 30-, 60-, or 90-day retention window, while Enterprise can retain it without limit.
Support: Free includes community Discord support, Pro includes email support, and Premium includes priority support with a 12-hour response target.
Limit: Noplag states that its current engine detects verbatim and near-verbatim copying and does not detect paraphrase.
Price from: $9.99/mo

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Where it ranks on The Geeks Club

Best Plagiarism Checkers in 2026#1 of 31
Best Plagiarism Detection Software in 2026#1 of 28
Best AI Plagiarism Checkers in 2026#1 of 26

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Sources

noplag.com· checked 29 Sept 2026
noplag.com/features· checked 29 Sept 2026
noplag.com/pricing· checked 29 Sept 2026
noplag.com/legal/gdpr· checked 29 Sept 2026